| 摘要 |
PURPOSE:To prevent a fault due to continuous transmission, by measuring transmission time, and disconnecting a power source supplied to a radio device, when the continuous transmission time exceeds the setting time of a time limiting circuit. CONSTITUTION:A current detecting circuit part 1 is inserted between an input and an output to detect current to be supplied to a load. When a current more than the set value of the detector flows, the detected output is applied to the time limiting circuit part 2. The circuit part 2 discriminates whether the input from the circuit part 1 is continuously applied for a period more than a fixed setting time or not; and when the input from the circuit part 1 is applied more than the setting time, it sends an output to a relay part 3 and a fault displaying part 4. When a relay A is actuated, its contact a2 is closed and held by itself. By the continuous transmission inhibiting method, the fault due to continuous transmission can be prevented without operating the radio device itself during use. |
